virt-admin: Make --timeout of daemon-timeout positional argument

We currently require full argument specification:

  virt-admin daemon-timeout --timeout X

Well, the '--timeout' feels a bit redundant. Turn the argument
into a positional so that the following works too:

  virt-admin daemon-timeout X

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

docs/manpages/virt-admin.rst

@@ -320,7 +320,7 @@ daemon-timeout
 
 ::
 
-   daemon-timeout --timeout NUM
+   daemon-timeout [--timeout] NUM
 
 Sets the daemon timeout to the value of '--timeout' argument. Use ``--timeout 0``
 to disable auto-shutdown of the daemon.

tools/virt-admin.c

@@ -1009,6 +1009,7 @@ static const vshCmdOptDef opts_daemon_timeout[] = {
     {.name = "timeout",
      .type = VSH_OT_INT,
      .required = true,
+     .positional = true,
      .help = N_("number of seconds the daemon will run without any active connection"),
     },
     {.name = NULL}